use std::collections::HashMap;

/// 类型约束
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum TypeConstraint {
    /// 必须是指定类型
    MustBe(String),
    /// 必须实现指定接口
    MustImplement(String),
    /// 必须是可比较的
    MustBeComparable,
    /// 必须是可哈希的
    MustBeHashable,
    /// 必须是可迭代的
    MustBeIterable,
    /// 必须是可索引的
    MustBeIndexable,
    /// 必须是可调用的
    MustBeCallable,
}

/// 类型约束管理器
pub struct TypeConstraintManager {
    /// 类型约束映射
    constraints: HashMap<String, Vec<TypeConstraint>>,
}

impl TypeConstraintManager {
    /// 创建新的类型约束管理器
    pub fn new() -> Self {
        TypeConstraintManager {
            constraints: HashMap::new(),
        }
    }

    /// 添加类型约束
    pub fn add_constraint(&mut self, type_name: String, constraint: TypeConstraint) {
        self.constraints
            .entry(type_name)
            .or_insert_with(Vec::new)
            .push(constraint);
    }

    /// 获取类型的所有约束
    pub fn get_constraints(&self, type_name: &str) -> Vec<TypeConstraint> {
        self.constraints.get(type_name).cloned().unwrap_or_default()
    }

    /// 检查类型是否满足所有约束
    pub fn check_constraints(&self, type_name: &str, actual_type: &str) -> bool {
        let constraints = self.get_constraints(type_name);
        for constraint in constraints {
            if !self.check_single_constraint(&constraint, actual_type) {
                return false;
            }
        }
        true
    }

    /// 检查单个约束
    fn check_single_constraint(&self, constraint: &TypeConstraint, actual_type: &str) -> bool {
        match constraint {
            TypeConstraint::MustBe(expected_type) => actual_type == expected_type,
            // 其他约束的简化实现，实际需要更复杂的逻辑
            TypeConstraint::MustImplement(_) => true,
            TypeConstraint::MustBeComparable => true,
            TypeConstraint::MustBeHashable => true,
            TypeConstraint::MustBeIterable => true,
            TypeConstraint::MustBeIndexable => true,
            TypeConstraint::MustBeCallable => true,
        }
    }
}
